About this replacement
Air Liquide Blease 5500 Osiris 3 — 9.6V Ni-MH Replacement Battery (YR109301)
This is a 9.6V, 1500mAh Ni-MH replacement battery for the Blease 5500 Osiris 3 anesthesia workstation. It also fits the Taema Respirator Osiris 3 and Ventilator Osiris 3 platforms. OEM part numbers YR109301 and YR109301031404 both apply to this cell configuration.
- Osiris 3 platform fit: The Blease 5500, Taema Respirator, and Ventilator Osiris 3 share the same battery bay geometry, voltage rail, and connector. All three draw from this 9.6V cell to maintain control system function and backup power during mains interruption.
- Bench tested on actual hardware: We cycled this battery through charge and load sequences matching the Osiris 3's backup draw profile. The BMS accepted the cell without fault codes on a conditioned unit after one full charge-discharge cycle.
- Post-installation self-test protocol: After fitting this battery, allow the Osiris 3 to complete its full power-on self-test without interruption. The device runs a BMS verification sequence at startup — cutting power during this step generates a false battery fault that persists until the next clean reboot.
Self-test failure after battery swap on the Osiris 3
The Osiris 3 runs an internal BMS learn cycle during its first few charge-discharge sequences with a new cell. A fresh Ni-MH battery has not yet established the internal resistance baseline the device expects. If the self-test fails immediately after installation, run one full charge-discharge cycle outside clinical use before relying on the battery. This gives the BMS enough data to set accurate state-of-charge thresholds.
Charge indicator not reaching 100% on the first charge after installation
On the first charge, the Osiris 3's charge IC applies a conservative current limit against a new Ni-MH cell — this is normal behaviour, not a cell fault. The indicator typically stalls below full because the charge algorithm hasn't confirmed the cell's peak voltage signature yet. Run a complete charge cycle, then discharge under normal standby load, and repeat once. By the second charge the indicator should reach the full threshold consistently.